Depending how far the mapper has taken things, then the car could easily be suffering from det that you may not hear in the car but still cause damage to the engine.
If i was you i wouldnt be giving the car any stick until i'd re-filled with V-Power.
On a side note, if the car isnt detting on 95 ron, then he hasnt mapped it as well as he could have, which will mean you wont have as much power as you could have :'(